Single-barrel gun



FIG. 1 is a side elevational view of a single barrel gun showing my new design with the opposite side being a mirror image;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for a single-barrel gun, as shown and described. 